EP1067348B1 - Verfahren und Vorrichtung zum Trocknen von Granulat - Google Patents
Verfahren und Vorrichtung zum Trocknen von Granulat Download PDFInfo
- Publication number
- EP1067348B1 EP1067348B1 EP00112648A EP00112648A EP1067348B1 EP 1067348 B1 EP1067348 B1 EP 1067348B1 EP 00112648 A EP00112648 A EP 00112648A EP 00112648 A EP00112648 A EP 00112648A EP 1067348 B1 EP1067348 B1 EP 1067348B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drying
- drying air
- individual
- heating device
- containers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
- F26B21/083—Humidity by using sorbent or hygroscopic materials, e.g. chemical substances, molecular sieves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
Definitions
- the invention relates to a method for drying Granules in at least two drying containers using heated Drying air through the drying container connected in parallel and circulated through a drying air dryer , each drying air stream supplied to a drying tank with one assigned to this drying container Individual heating device is heated and the individual drying container supplied drying air flow depending on one of the current conditions in the concerned Drying container reflecting temperature more or less is throttled.
- Such a method is known from EP 61 161 A.
- There are three drying containers connected in parallel are provided, in their Branch line inlet one throttle each before Drying container is installed, which is controlled by an actuator Depending on the signal from a temperature sensor, which is arranged in the branch line outlet behind the drying container is.
- the drying air dryer has adsorption cells on, through which the circulating drying air and a Regeneration agents (hot air) are passed through. Indeed only one common heating device is provided and at the exit of the drying air dryer is the drying air passed through the only heater before entering the Flow line to the drying containers enters.
- the method described at the outset is known from DE 296 21 313 U.
- the drying system described there has three in parallel switched on drying containers, each with a single heating device and a throttle device for that Drying container supplied drying air assigned are. It is therefore possible to use the drying container To feed drying air of different temperatures, which is useful, for example, if in the individual Drying containers can be dried different materials should, because of different temperature sensitivity different temperatures should be dried. There however, the air volume distribution over the individual drying containers by the extent of the throttling of the individual drying containers supplied drying air flows is determined, the situation may arise that one of the individual heating devices excessively strong with a high drying air flow is claimed so that the intended heating temperature the drying air may no longer be reached. To the Maintain the setpoint temperature in all operating states may need to be over-performing disadvantageously and thus complex individual heating devices are used become.
- the invention is based on the object to improve known methods so that for the individual Drying container drying air of different temperatures can be provided and the target temperatures of the various drying air flows under all operating conditions can be achieved without being overly powerful Heaters must be used.
- drying air flows not only temperature-dependent but also dependent of the respective heating output of the individual heating device in question be controlled so that when reaching predetermined heating power of the individual heater relevant drying air flow is additionally throttled, so that its heating to a preselected target temperature is independent from the distribution of drying air to the individual Drying air flows is guaranteed.
- the provision of the individual heating devices creates the possibility the drying air flows supplied to the various drying containers according to the respective requirements to heat different temperatures. Will the capacity of a single heater because the concerned Drying air flow due to severe throttling of the others Drying air flows increases sharply and / or for the person concerned Drying air flow a comparatively high target temperature is specified, the drying air flow concerned experiences throttling until the ratio of drying air flow sufficient for the available heating capacity, to achieve the target temperature. Therefore, oversized Individual heating devices can be dispensed with without that there is a risk that under extreme operating conditions the target temperature of the drying air on one of the drying tanks is not reached.
- the method according to the invention becomes dependent on the use of Individual heating devices that can be switched on and off automatically Conveniently carried out so that the heat output dependent Additional throttling of a drying air flow is triggered when the individual heating device in question does not turn off within a predetermined period of time.
- the continuous operation of the individual heating device ascertained during the period is evaluated in the sense that the heating power not sufficient for the current drying air throughput to reach the target temperature.
- the invention also relates to a device for performing of the method according to the invention with at least two Drying containers and a drying air dryer, which in a drying circuit for drying air having a blower are installed, the one flow line and one Return line and these connecting branch lines for the parallel arrangement of the drying container, wherein in a throttle valve for each branch line inlet to the drying tank and one each assigned to this drying container Individual heating devices are installed and each drying container a temperature sensor is assigned, which is via a signal line with a control unit for adjusting the throttle valve connected is.
- the known device improved according to the invention in that each individual heating device via a heating power signal line with the control unit for the throttle valve assigned to the same drying container connected is.
- each Throttle valve in the individual heating device behind each Throttle valve arranged. This allows the individual heating device arrange close to the associated drying container, what the heat losses are reduced or the effort for insulation measures decreases. At the same time, the throttle valve is less heat stress.
- the temperature sensors are each installed in the relevant drying container. In this way, reliable temperature values can be obtained achieve for the control of the device.
- FIG. 1 An embodiment of a device according to the invention is explained in more detail below with the aid of a schematic drawing.
- the only figure shows essentially one Top view of a device with two shown in side view Drying containers and with a drying air dryer.
- the regeneration circuit 8 are one behind the other in the flow direction a suction filter 1, a regeneration blower 2, a Regeneration heater 3 and the two reversing valves 4a, 4b installed, between which two adsorption cells 5a, 5b are arranged are.
- the two reversing valves 4a, 4b and the two adsorption cells 5a, 5b are also the drying cycle in the same way 9 assigned so that by reversing the reversing valves 4a, 4b the two adsorption cells 5a, 5b alternately in the Regeneration circuit 8 or switched on in the drying circuit 9 are.
- the drying circuit 9 is with a blower 6 for the Drying air and provided with a filter 7 for the return air.
- the drying circuit 9 includes a flow line 11 and a return line 12 for the circulating drying air and a first branch line with a branch line inlet 21 and a branch line outlet 28 and a second branch line with a branch line inlet 31 and a branch line outlet 38, each to the flow line 11 or to the return line 12 connected and through a first drying container 20 or a second drying container 30 with each other are connected.
- the two drying containers 20 and 30 are used to dry granulate, which is known to and is dissipated, so that further explanations are not required are.
- each branch line inlet 21, 31 contains one Throttle valve 22a, 32a and a single heater 23a, 33a.
- the heating output is regulated so that the drying container 20, 30 supplied drying air if necessary the granulate to be dried has a set temperature.
- a temperature sensor 23e, 33e arranged via a signal line 23d, 33d is connected to a control unit 23c, 33c, which the Heat supply through the heating line 23b, 33b to the individual heating device 23a, 33a controls.
- the throttle valve 22a, 32a enables the air throughput to be adjusted to the granulate throughput through the drying container 20, 30 to in this optimal drying conditions (Drying temperatures). This is in the Drying container 20, 30 a temperature sensor 22e, 32e installed, the container temperature via a signal line 22d, 32d reports to a control unit 22c, 32c. This creates a Control signal for the throttle valve 22a, 32a, to this over a control line 22b, 32b is transmitted.
- the control unit 23c, 33c for the heating power is via a signal line 24, 34 with the control unit 22c, 32c for the throttle valve 22a, 32a and supplies it with the heating power relevant data.
- the granules filled in the drying containers 20, 30 at which are different materials with different materials Properties can be dealt with by the Drying circuit 9 by means of the blower 6 circulating drying air dried, for example by means of the adsorption cell 5b is continuously dehumidified.
- the adsorption cell 5a in the regeneration circuit 8 arranged and is regenerated accordingly.
- the reversing valves 4a, 4b switched, so that now the freshly regenerated adsorption cell 5a in the drying cycle 9 and the more or less exhausted adsorption cell 5b in Regeneration circuit 8 is and is now regenerated. This Switching between the adsorption cells 5a and 5b continues accordingly.
- the drying containers 20, 30 individually supplied drying air in the individual heating devices 23b, 33b except for the one provided Target temperature heated.
- 32e is determined temperature value the throttle valve 22a, 32a via the control unit 22c, 32c an optimal drying air throughput in the drying container concerned 20, 30 set.
Description
Claims (4)
- Verfahren zum Trocknen von Granulat in mindestens zwei Trocknungsbehältern (20, 30) mittels erwärmter Trocknungsluft, die durch die parallel geschalteten Trocknungsbehälter (20, 30) und durch einen Trocknungslufttrockner (10) umgewälzt wird, wobei jeder einem Trocknungsbehälter (20, 30) zugeführte Trocknungsluftstrom mit einer diesem Trocknungsbehälter (20 bzw. 30) zugeordneten Einzelheizeinrichtung (23a, 33a) erwärmt wird und der dem einzelnen Trocknungsbehälter (20, 30) zugeführte Trocknungsluftstrom jeweils in Abhängigkeit von einer die momentanen Verhältnisse im betreffenden Trocknungsbehälter (20, 30) widerspiegelnden Temperatur mehr oder minder gedrosselt wird, dadurch gekennzeichnet, daß die Trocknungsluftströme nicht nur temperaturabhängig sondern auch in Abhängigkeit von der jeweiligen Heizleistung der betreffenden Einzelheizeinrichtung (23a, 33a) derart gesteuert werden, daß bei Erreichen einer vorbestimmten Heizleistung der Einzelheizeinrichtung (23a, 33a) der betreffende Trocknungsluftstrom zusätzlich gedrosselt wird, so daß seine Aufheisung auf eine vorgewählte Solltemperatur unabhängig von der Trocknungsluftmengenverteilung auf die einzelnen Trocknungsluftströme gewährleistet ist.
- Verfahren nach Anspruch 1 mit bedarfsabhängig selbsttätig an- und abschaltbaren Einzelheizeinrichtungen (23a, 33a), dadurch gekennzeichnet, daß die heizleistungsabhängige Zusatzdrosselung eines Trocknungsluftstroms dann ausgelöst wird, wenn die betreffende Einzelheizeinrichtung (23a, 33a) innerhalb einer vorbestimmten Zeitspanne nicht abschltet.
- Vorritchung zum Durchführen des Verfahrens nach Anspruch 1 oder 2 mit mindestens zwei Trocknungsbehältern (20, 30) und einem Trocknungslufttrochner (10), die in einen ein Gebläse (6) aufweisenden Trocknungskreislauf (9) für Trocknungslüft eingebaut sind, der eine Vorlaufleitung (11) und eine Rücklaufleitung (12) und diese verbindende Zweigleitungen (21, 28; 31, 38) für die parallele Anordnung der Trocknungsbehälter (20, 30) aufweist, wobei in jeden Zweigleitungszulauf (21, 31) zum Trocknungsbehälter (20, 30) eine Drosselklappe (22a, 32a) und eine jeweils diesem Trocknungsbehälter (20, 30) zugeordnete Einzelheizeinrichtung (23a, 33a) eingebaut sind und jedem Trocknungsbehälter (20, 30) ein Temperaturfühler (22e, 32e) zugeordnet ist, der über eine Signalleitung (22d, 32d) mit einem Steuergerät (22c, 32c) zur Verstellung der Drosselklappe (22a, 32a) verbunden ist, dadurch gekennzeichnet, daß jede Einzelheizeinrichtung (23a, 33a) über eine Heizleistungs-Signalleitung (24, 34) mit dem Steuergerät (22c, 32c) für die demselben Trocknungsbehälter (20, 30) zugeordnete Drosselklappe (22a, 32a) verbunden ist.
- Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß in jeder Zulaufzweigleitung (21, 31) die Einzelheizeinrichtung (23a, 33a) hinter der Drosselklappe (22a, 32a) angeordnet ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19931357A DE19931357C1 (de) | 1999-07-07 | 1999-07-07 | Verfahren und Vorrichtung zum Trocknen von Granulat |
DE19931357 | 1999-07-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1067348A1 EP1067348A1 (de) | 2001-01-10 |
EP1067348B1 true EP1067348B1 (de) | 2003-08-20 |
Family
ID=7913946
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00112648A Expired - Lifetime EP1067348B1 (de) | 1999-07-07 | 2000-06-15 | Verfahren und Vorrichtung zum Trocknen von Granulat |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1067348B1 (de) |
AT (1) | ATE247812T1 (de) |
BR (1) | BR0002304A (de) |
CA (1) | CA2312511A1 (de) |
DE (2) | DE19931357C1 (de) |
ES (1) | ES2204403T3 (de) |
MX (1) | MXPA00006721A (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006049437B3 (de) * | 2006-10-16 | 2008-03-27 | Lanco Gmbh | Vorrichtung zum Trocknen von Schüttgut sowie Verfahren zum Trocknen von Schüttgut unter Verwendung einer solchen Vorrichtung |
EP2020581A1 (de) * | 2007-08-03 | 2009-02-04 | Moretto S.P.A. | Anlage und Verfahren zur gesteuerten Entfeuchtung von körnigem Material |
DE102015005822A1 (de) * | 2015-05-05 | 2016-11-10 | Zbk Zentrum Für Baukeramik Gmbh | Anlage und Verfahren zm Trocknen keramischer Rohstoffe oder Rohlinge |
DE102015116876A1 (de) * | 2015-10-05 | 2017-04-06 | Zbk Zentrum Für Baukeramik Gmbh | Anlage und Verfahren zum Trocknen keramischer Rohstoffe und Rohlinge |
CN106903987A (zh) * | 2017-03-13 | 2017-06-30 | 广州黑马科技有限公司 | 凹版印刷机空气循环系统 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3131471A1 (de) * | 1981-03-20 | 1982-09-30 | Roderich Wilhelm Dr.-Ing. 6100 Darmstadt Gräff | Vorrichtung zum trocknen feuchter abluft aus einem oder mehreren schuettgut-trocknungsbehaeltern |
GB2122384A (en) * | 1982-06-14 | 1984-01-11 | Conair | Plastics material drying cycle |
DE4037443A1 (de) * | 1990-11-24 | 1992-05-27 | Mann & Hummel Filter | Vorrichtung zum trocknen von schuettgut |
DE4234696C2 (de) * | 1991-10-14 | 1994-06-09 | Werner Koch | Vorrichtung zum Trocknen von Kunststoffschüttgut |
DE4321863C2 (de) * | 1993-07-01 | 2000-01-05 | Behr Gmbh & Co | Verfahren und Vorrichtung zur Desorption eines Feuchtigkeit adsorbierenden Materials |
DE4321895A1 (de) * | 1993-07-01 | 1995-01-12 | Holger Achelpohl | Verfahren und Vorrichtung zum Trocknen von Schüttgut, vorzugsweise von Kunststoffgranulat |
DE29621313U1 (de) * | 1996-12-07 | 1997-01-30 | Digicolor Gmbh | Vorrichtung zum Trocknen von Granulat |
-
1999
- 1999-07-07 DE DE19931357A patent/DE19931357C1/de not_active Expired - Fee Related
-
2000
- 2000-06-15 DE DE50003340T patent/DE50003340D1/de not_active Expired - Lifetime
- 2000-06-15 EP EP00112648A patent/EP1067348B1/de not_active Expired - Lifetime
- 2000-06-15 AT AT00112648T patent/ATE247812T1/de not_active IP Right Cessation
- 2000-06-15 ES ES00112648T patent/ES2204403T3/es not_active Expired - Lifetime
- 2000-06-27 CA CA002312511A patent/CA2312511A1/en not_active Abandoned
- 2000-07-04 BR BR0002304-3A patent/BR0002304A/pt not_active Application Discontinuation
- 2000-07-07 MX MXPA00006721A patent/MXPA00006721A/es unknown
Also Published As
Publication number | Publication date |
---|---|
CA2312511A1 (en) | 2001-01-07 |
EP1067348A1 (de) | 2001-01-10 |
ATE247812T1 (de) | 2003-09-15 |
MXPA00006721A (es) | 2005-04-01 |
DE19931357C1 (de) | 2001-04-05 |
BR0002304A (pt) | 2001-03-13 |
DE50003340D1 (de) | 2003-09-25 |
ES2204403T3 (es) | 2004-05-01 |
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